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Scientific news from Division 6

News 2022

For decades, the irradiation facility for beta radiation, the Beta Secondary Standard BSS 2 developed at PTB, has been in worldwide use to irradiate dosemeters, detectors and other devices with calibrated beta sources. In this work two energy-reduced radiation fields based on the 90Sr/90Y source are described. The fields with beta mean energies around 0.5 MeV and 0.6 MeV fill the gap between...

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Several correction factors for primary beta dosimetry in radiation protection have been re‑determined by means of measurements and simulations for primary extrapolation ionization chambers. The data are ready for adoption in the international standard series ISO 6980 for beta reference radiation fields.

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Examinations by means of computed tomography (CT) are responsible for about 65 % of artificial radiation exposure in Germany. The aim of personalized CT dosimetry is to individually measure the radiation dose transferred to a particular patient by the radiation field of the CT scanner. High‑precision Monte Carlo (MC) computer simulations are of utmost importance for achieving new developments in...

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In cooperation with the Laboratoire National Henri Becquerel in France, the beta spectrum of samarium‑151 was thoroughly investigated. Measurement data obtained by means of a metallic magnetic calorimeter were used to determine the beta end-point energy with unprecedented accuracy. Furthermore, the researchers involved in this project succeeded in determining the decay probabilities of two...

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Zirconium‑89 is a radionuclide that can be used for diagnostic applications in medicine. At PTB, activity determinations have now been carried out by means of liquid scintillation counting in order to enable reliable calibrations of zirconium‑89 solutions in the future. In addition, ionization chamber measurements have been used to very accurately determine the half‑life of zirconium‑89.

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